CN109822038B - Local die forging forming method for connecting rod of marine low-speed diesel engine - Google Patents
Local die forging forming method for connecting rod of marine low-speed diesel engine Download PDFInfo
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- CN109822038B CN109822038B CN201910059086.8A CN201910059086A CN109822038B CN 109822038 B CN109822038 B CN 109822038B CN 201910059086 A CN201910059086 A CN 201910059086A CN 109822038 B CN109822038 B CN 109822038B
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Abstract
The invention relates to a local die forging forming method for a connecting rod of a marine low-speed diesel engine, which adopts a free forging mode to forge a steel ingot into a blank of the connecting rod of the low-speed diesel engine; sawing two ends of the blank flat, processing a rod part, and preprocessing the rod part into a die forging blank of the connecting rod of the low-speed diesel engine; locally heating the thick end or the thin end of the connecting rod die forging blank of the low-speed diesel engine by using a heating furnace; forging the heated end by using a die for locally forging the special-shaped connecting rod at two ends to form an inner concave surface of the heated end and simultaneously form a transition surface and an appearance to obtain a semi-finished product of the connecting rod of the low-speed diesel engine; and heating the other end, replacing the die, and forming an inner concave surface, a transition surface and the shape of the other end to obtain the low-speed diesel engine connecting rod. The invention can realize the die forging of the connecting rod on the free forging press, has simple blank manufacturing, no eccentric load of the die forging and small forming force; the shape and size are close to the appearance of the connecting rod part, and a large forging with a complex shape can be forged in a copying way; the metal continuity of the two-end bifurcation of the connecting rod can be kept, the technical dressings are greatly reduced, and the cost is low.
Description
Technical Field
The invention belongs to the technical field of die forging forming of heavy forgings, and particularly relates to a local die forging forming method of a connecting rod of a marine low-speed diesel engine.
Background
The marine diesel engine connecting rod is an important part in a marine engine, two ends of the marine diesel engine connecting rod are respectively connected with a piston rod and a crankshaft (crank), the reciprocating motion of a piston is converted into the rotating motion of the crankshaft, and the force acting on the piston is transmitted to the crankshaft, so that the transmission of the motion and the energy is realized. The marine diesel engine connecting rod is subjected to a complex stress state by cyclic tension and compression from a piston and transverse and longitudinal inertia force generated during conversion movement. Therefore, the marine diesel connecting rod is required to have both high strength and fatigue resistance and sufficient rigidity and toughness.
The marine diesel engine connecting rod (see figure 6) has complex appearance, large weight and size specification, 2t-6t and 2m-3m length. The prior art is produced by a free forging and machining mode, a connecting rod blank 10 (shown in figure 2) of a current low-speed diesel engine is produced by the free forging mode, a solid line in the figure is the blank appearance, and a two-dot chain line is the connecting rod part appearance. It has several outstanding problems:
1. in the free forging mode, the thick end outer spherical surface and the thin end conical surface of the connecting rod forging cannot be precisely forged out through free forging, only square steps can be forged, materials are removed through subsequent machining, the appearance size is obtained, a large amount of process auxiliary materials are needed for a blank, the process auxiliary materials are necessary in the free forging mode and cannot be overcome, so that huge waste of raw materials is caused, and a large amount of machining working hours are wasted; the inner concave surfaces at two ends of the connecting rod of the marine diesel engine can not be forged out by free forging, the free forging can only be completely forged into a solid state, and materials are removed by subsequent machining to obtain the inner concave surfaces;
2. the marine diesel engine connecting rod has a complex shape, and the free forging precision is low, so that a machining allowance of 40-50mm is usually reserved, and the waste of machining working hours is caused.
3. The connecting rod blank of the marine diesel engine produced by free forging is machined to remove materials to form the shapes and the inner concave surfaces at two ends, so that metal fibers are cut off, the continuity of a forging structure is damaged, the internal quality advantage of the connecting rod of the marine diesel engine is weakened, and the connecting rod blank of the marine diesel engine is unfavorable for the quality and the service life of the connecting rod of the marine diesel engine.
For small connecting rods, such as connecting rods of automobile engines (with the weight of 1 kg-2 kg), the whole connecting rod is generally formed by full die forging on a die forging press, namely, blanks are put into upper and lower dies to be die-forged, and the precision and the efficiency are high. Full die forging similar to the small connecting rod is not possible because: 1. the weight of the connecting rod of the marine diesel engine is up to several tons, the force required by full die forging is very huge, and dozens of thousands of tons of pressure are expected to be required; 2. the thickness size and the shape of the thin end and the thick end are greatly different, the forming force is asymmetric, and serious unbalance loading is generated during full die forging. The marine diesel engine connecting rod adopts full die forging, and has no feasibility in the aspects of equipment and technology.
In conclusion, the method for locally die forging the marine diesel engine connecting rod is researched and developed, two ends of the marine diesel engine connecting rod are respectively formed through local die forging, and the method has very important practical significance and value.
Disclosure of Invention
The invention aims to provide a local die forging forming method for a connecting rod of a marine low-speed diesel engine, which can reduce process auxiliary materials, save raw materials by more than 40%, reduce machining amount by about 80%, effectively shorten the manufacturing period and reduce the machining cost.
The invention aims to realize a local die forging forming method of a connecting rod of a marine low-speed diesel engine, which comprises the following specific steps:
1) forging a steel ingot into a low-speed diesel engine connecting rod blank in a free forging mode;
the relationship between the thick end of the connecting rod blank of the low-speed diesel engine and the thick end of the connecting rod of the die forging forming marine low-speed diesel engine is as follows: the included angle between the thick end cone part and the rod part of the connecting rod blank of the low-speed diesel engine is more than 120 degrees;
the thick end volume of the connecting rod die forging blank of the low-speed diesel engine is 1.05 to 1.2 times of the thick end volume of the connecting rod of the low-speed diesel engine for die forging forming of the ship,
the width of the thick end of the connecting rod blank of the low-speed diesel engine is 100-400 mm smaller than that of the thick end of the connecting rod of the low-speed diesel engine for the die forging forming ship;
the thickness of the thick end of the connecting rod blank of the low-speed diesel engine is 50-150 mm smaller than that of the thick end of the connecting rod of the low-speed diesel engine for the die forging forming ship;
the length of the thick end of the connecting rod blank of the low-speed diesel engine is calculated by the volume, the width and the thickness;
secondly, the relation between the rod part of the connecting rod die forging blank of the low-speed diesel engine and the rod part of the connecting rod of the low-speed diesel engine for the die forging forming ship is as follows:
the rod part volume of the connecting rod blank of the low-speed diesel engine is 0.9-0.95 times of the rod part volume of the connecting rod of the die forging forming marine low-speed diesel engine,
the diameter of the rod part of the connecting rod blank of the low-speed diesel engine is 1.05-1.1 times of the diameter of the rod part of the connecting rod of the low-speed diesel engine for die forging forming ship,
the length of the rod part of the connecting rod die forging blank of the low-speed diesel engine is 50-120 mm smaller than that of the connecting rod part of the low-speed diesel engine for the die forging forming ship;
the relation between the thin end of the connecting rod blank of the low-speed diesel engine and the thin end of the connecting rod of the low-speed diesel engine for the die forging forming ship is as follows: the included angle between the thin end cone part of the connecting rod blank of the low-speed diesel engine and the rod is more than 120 degrees;
the volume of the thin end of the connecting rod blank of the low-speed diesel engine is 1.05 to 1.2 times of the volume of the thin end of the connecting rod of the die forging forming marine low-speed diesel engine,
the width of the thin end of the connecting rod blank of the low-speed diesel engine is 100-400 mm larger than the width of the thin end of the connecting rod of the low-speed diesel engine for the ship formed by die forging;
the thickness of the thin end of the connecting rod die forging blank of the low-speed diesel engine is 0-50mm smaller than that of the thin end of the connecting rod of the low-speed diesel engine for the die forging forming ship;
the length of the thin end of the connecting rod die forging blank of the low-speed diesel engine is calculated by the volume, the width and the thickness;
2) sawing two ends of a connecting rod blank of a low-speed diesel engine flat, and processing a rod part to finish machining for 10mm allowance; the machining section of the rod part of the low-speed diesel engine connecting rod blank and the thick and thin end transition conical surfaces and the blank surface of the low-speed diesel engine connecting rod blank adopt conical surface transition of more than 120 degrees; obtaining a die forging blank of the connecting rod of the low-speed diesel engine through the pretreatment;
3) locally heating the thick end or the thin end of the low-speed diesel engine connecting rod die forging blank to a forging temperature by adopting a blank local heating furnace or a variable-capacity tunnel type connecting rod heating furnace;
4) performing die forging on the heated thick end or the heated thin end in the step 3) by adopting a die for locally forging the special-shaped connecting rod at two ends, forming an inner concave surface of the thick end or the thin end, and simultaneously forming a transition surface and an appearance of the thick end or the thin end to obtain a semi-finished product of the connecting rod of the low-speed diesel engine;
5) repeating the step 3), and heating the thin end or the thick end of the low-speed diesel engine connecting rod die forging blank which is not locally heated by using a blank local heating furnace or a variable-capacity tunnel type connecting rod heating furnace;
6) and (3) replacing the die, adopting the die for locally die forging the marine low-speed diesel engine connecting rod, repeating the step 4) to die forge the thin end or the thick end of the locally heated low-speed diesel engine connecting rod die forging blank in the step 5), forming an inner concave surface of the thin end or the thick end, and simultaneously forming a transition surface and the shape of the thin end or the thick end to obtain the low-speed diesel engine connecting rod.
The invention has the outstanding advantages that:
1. the connecting rod blank of the low-speed diesel engine formed by free forging does not need a special blank making die, has low requirement on the size of the blank, simple blank making process, no unbalance loading and small forming force, and makes the profiling forging of the connecting rod of the low-speed diesel engine possible;
2. the profile forging of the appearance of the connecting rod of the low-speed diesel engine is realized, process auxiliary materials required by freely forging the connecting rod are avoided, raw materials can be saved by more than 40%, the machining amount is reduced by about 80%, the manufacturing period is effectively shortened, and the machining cost is reduced;
3. the required blank is simple, the local size of the connecting rod blank of the low-speed diesel engine does not need to be accurately controlled, the requirements on the size and the appearance are not high, and a special blank making tool is not needed;
4. the low-speed diesel engine connecting rod blank is directly subjected to die forging to form the shapes and the concave surfaces of the two ends, so that the metal continuity of the two ends of the low-speed diesel engine connecting rod is kept to the maximum extent, and the defect that the continuity of metal fibers forged by the low-speed diesel engine connecting rod is damaged by a free forging and machining mode is overcome. The local die forging technical scheme can improve the internal quality of the connecting rod of the low-speed diesel engine and prolong the service life.
By adopting the invention, the forming force of the connecting rod of the low-speed diesel engine of various types is below 1 ten thousand tons, and the unbalance loading problem does not exist, so that the improvement of press equipment is not needed, and a special press is not needed to be invested.
Drawings
FIG. 1 is a view showing a partial die forging method according to the present invention,
FIG. 2 is a schematic diagram of a connecting rod blank of a conventional low-speed diesel engine;
FIG. 3 is a schematic diagram of a connecting rod blank of the low speed diesel engine of the present invention;
FIG. 4 is a schematic structural diagram of a connecting rod die forging blank of a low-speed diesel engine after pretreatment;
FIG. 5 is a schematic structural diagram of a low-speed diesel engine connecting rod semi-finished product obtained by locally forging a thick end;
fig. 6 is a schematic view of a low speed diesel engine connecting rod structure obtained by completing two-end partial die forging.
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings.
The method comprises the following specific steps:
1) and (3) forging the steel ingot into a low-speed diesel engine connecting rod blank shown in figure 3 in a free forging mode.
The thick end transition cone part 6-1 and the thin end cone part 8-1 between the flat square and the rod part of the low-speed diesel engine connecting rod die forging blank do not require absolute regulation, and allow irregular pits left by a free forging anvil of less than 30 mm.
The relationship between the thick end cone part 6-1 and the thick end part I6-2.1 of the connecting rod blank of the low-speed diesel engine and the thick end 6 of the connecting rod of the low-speed diesel engine for the die forging forming ship is as follows: the included angle between the thick end cone part 6-1 and the rod part 7-1 of the connecting rod blank of the low-speed diesel engine is more than 120 degrees;
the volume of the thick end cone part 6-1 and the thick end part one 6-2.1 of the connecting rod die forging blank of the low-speed diesel engine is 1.05-1.2 times of the volume of the thick end of the connecting rod of the die forging forming marine low-speed diesel engine,
the width of the thick end of the connecting rod blank of the low-speed diesel engine is 100-400 mm smaller than that of the thick end of the connecting rod of the low-speed diesel engine for the die forging forming ship;
the thickness of the thick end of the connecting rod blank of the low-speed diesel engine is 50-150 mm smaller than that of the thick end of the connecting rod of the low-speed diesel engine for the die forging forming ship.
The length of the thick end of the connecting rod blank of the low-speed diesel engine is calculated by the volume, the width and the thickness.
Secondly, because the rod part of the connecting rod blank of the low-speed diesel engine can slightly extend in the die forging process, and the diameter of the rod part needs to be preprocessed, the relationship between the rod part I7-1 of the connecting rod blank of the low-speed diesel engine and the rod part 7 of the connecting rod of the low-speed diesel engine for the die forging forming ship is as follows:
the rod part volume of the connecting rod blank of the low-speed diesel engine is 0.9-0.95 times of the rod part volume of the connecting rod of the die forging forming marine low-speed diesel engine,
the diameter of the rod part of the connecting rod blank of the low-speed diesel engine is 1.05-1.1 times of the diameter of the rod part of the connecting rod of the low-speed diesel engine for die forging forming ship,
the length of the rod part of the connecting rod die forging blank of the low-speed diesel engine is 50-120 mm smaller than that of the connecting rod part of the low-speed diesel engine for the die forging forming ship;
thirdly, the thin end cone part 8-1 and the thin end part one 9-1.1 of the connecting rod die forging blank of the low-speed diesel engine and the thin end cone part 8 and the thin end part 9 of the connecting rod of the low-speed diesel engine for the die forging forming ship are in the following relations: the included angle between the thin end cone part 8-1 and the rod part 7-1 of the connecting rod die forging blank is more than 120 degrees;
the volume of the thin end of the connecting rod blank of the low-speed diesel engine is 1.05 to 1.2 times of the volume of the thin end of the connecting rod of the die forging forming marine low-speed diesel engine,
the width of the thin end of the connecting rod blank of the low-speed diesel engine is 100-400 mm smaller than that of the thin end of the connecting rod of the low-speed diesel engine for forming the ship by die forging;
the thickness of the thin end of the connecting rod die forging blank of the low-speed diesel engine is 0-50mm smaller than that of the thin end of the connecting rod of the low-speed diesel engine for the die forging forming ship;
the length of the thin end of the connecting rod die forging blank of the low-speed diesel engine is calculated by the volume, the width and the thickness.
2) Sawing two ends of a connecting rod die forging blank of a low-speed diesel engine flat, and removing excess materials at the two ends; machining the rod part to a finish machining allowance of 10 mm; the machining section of the rod part of the low-speed diesel engine connecting rod blank and the thick and thin end transition conical surfaces and the blank surface of the low-speed diesel engine connecting rod blank adopt conical surface transition of more than 120 degrees; and the low-speed diesel engine connecting rod die forging blank shown in the figure 4 and having the thick end part two 6-2.2 and the thin end part two 9-1.2 is obtained through the pretreatment.
3) The thick ends 6-1 and 6-2.2 are locally heated to the forging temperature by using the blank local heating furnace or the variable-capacity tunnel type connecting rod heating furnace applied on the same day.
The specific method for heating by using the blank local heating furnace comprises the following steps:
opening the furnace door, extending a piston rod of the hydraulic cylinder, and turning the turning platform around the rotating shaft to a horizontal state; hoisting the low-speed diesel engine connecting rod die forging blank to a turnover platform of a turnover mechanism in a horizontal state, and putting the end of the low-speed diesel engine connecting rod die forging blank needing to be heated into a blank local heating furnace; selecting a clutch and a clutch of a hole with the section and the size matched with those of the blank non-heating section, and mounting the clutch and the clutch on a furnace door; closing the furnace door, and precisely fitting the holes of the clutch nut and the clutch nut with the non-heating section of the connecting rod die forging blank of the low-speed diesel engine; starting a heat source to heat a section of the connecting rod die forging blank of the low-speed diesel engine, which needs to be heated; after the temperature is sufficiently preserved at the forging temperature, the furnace door is opened, and a piston rod of the hydraulic cylinder returns to drive the overturning platform to overturn downwards around the rotating shaft to a vertical state; hoisting the die forging blank of the connecting rod of the low-speed diesel engine, wherein the heating process of the die forging blank of the connecting rod of the low-speed diesel engine in a heating section is completed;
the heat affected zone of the rod part 7-1 of the marine low-speed diesel engine is reduced as much as possible during local heating;
the heating method with the variable-capacity tunnel type connecting rod heating furnace is that the low-speed diesel engine connecting rod die forging blank is hung on an objective table, the end needing to be heated is upward, the non-heated end is positioned in a foundation pit, and a sealing block is inserted for sealing; the loading vehicle hung with the low-speed diesel engine connecting rod die forging blanks advances forwards along the track and enters the furnace chamber, the processes are repeated, the subsequent loading vehicles are connected end to end and sequentially loaded, and after the feeding quantity reaches a preset quantity, the furnace chamber is sealed along with the movable trolley loaded feeding furnace door; heating the forging blank to a forging temperature by a heating system; when discharging, a discharging furnace door is opened, all the loading cars and the feeding furnace door in the furnace move forward by a station, the first low-speed diesel engine connecting rod die forging blank is pushed out of the furnace chamber, the discharging furnace door is closed, and the rest low-speed diesel engine connecting rod die forging blanks continue to preserve heat; after the blank is taken out of the furnace, the sealing block is drawn out, and the hanging tongs clamp the die forging blank of the connecting rod of the low-speed diesel engine to exit from the U-shaped groove and hang away; and repeating the process to finish discharging.
4) The die forging method for the heated end by adopting the die for locally forging the special-shaped connecting rod at two ends, which is applied on the same day, comprises the following steps of:
referring to fig. 1, two half dies 3 on a fixed support 5 are opened, and a low-speed diesel engine connecting rod die forging blank 2 is lifted into the middle of the half dies with the heated ends upward; the push-pull head pushes the two half-moulds to be matched; and an outer mold ring 4 is sleeved to hoop the two half molds. The press drives the punch 1 into the heated end of the half mould which is shaped to form the low speed diesel link blank as shown in figure 5. The outer die ring, the half die and the low-speed diesel engine connecting rod semi-finished product are hoisted out together by using 'heavy forging hanging tongs' applied by the applicant on the same day, the outer die ring is separated and moved away, the half die is pulled open, and the low-speed diesel engine connecting rod semi-finished product is hoisted out;
the shape of a cavity formed by the two half moulds is consistent with that of the two ends of the connecting rod, and a finish machining allowance is reserved in the cavity for 3-5 mm.
The punch is consistent with the concave surfaces of the thick end or the thin end at the two ends of the connecting rod of the low-speed diesel engine, and a finish machining allowance of 5-10mm is reserved on the concave surfaces.
5) Repeating the step 3), and heating the thin end of the low-speed diesel engine connecting rod forging material which is not locally heated by a blank local heating furnace or a variable-capacity tunnel type connecting rod heating furnace; the heat affected zone to the rod part should be minimized during local heating;
6) replacing the die, and repeating the step 4) to perform die forging on the locally heated thin end of the connecting rod forging material of the low-speed diesel engine in the step 5) by adopting the die for locally die forging the connecting rod of the low-speed diesel engine applied on the same day; a low speed diesel engine connecting rod as shown in fig. 6 is formed.
The thick end or the thin end is heated firstly, the heating and forming sequence is not limited, and for the implementation of the invention, the thick end is heated and formed firstly, and the thin end is heated and formed secondly.
The invention heats the thick end or the thin end to the forging temperature and keeps the temperature, and the heating temperature and the heat preservation time are calculated and determined according to the steel grade and the section size and according to the industry specification; when heated, attention is paid to sealing to reduce the heat affected zone of the stem.
Claims (6)
1. The local die forging forming method for the connecting rod of the marine low-speed diesel engine is characterized by comprising the following specific steps of:
1) forging a steel ingot into a low-speed diesel engine connecting rod blank in a free forging mode;
the relationship between the thick end of the connecting rod blank of the low-speed diesel engine and the thick end of the connecting rod of the die forging forming marine low-speed diesel engine is as follows: the included angle between the thick end cone part and the rod part of the connecting rod blank of the low-speed diesel engine is more than 120 degrees;
the thick end volume of the connecting rod die forging blank of the low-speed diesel engine is 1.05 to 1.2 times of the thick end volume of the connecting rod of the low-speed diesel engine for die forging forming of the ship,
the width of the thick end of the connecting rod blank of the low-speed diesel engine is smaller than the width A of the thick end of the connecting rod of the low-speed diesel engine for the die forging forming ship, wherein A is 100-400 mm;
the thickness of the thick end of the connecting rod blank of the low-speed diesel engine is smaller than that of the thick end of the connecting rod of the low-speed diesel engine for the die forging forming ship by B, and B is 50-150 mm;
the length of the thick end of the connecting rod blank of the low-speed diesel engine is calculated by the volume, the width and the thickness;
secondly, the relation between the rod part of the connecting rod die forging blank of the low-speed diesel engine and the rod part of the connecting rod of the low-speed diesel engine for the die forging forming ship is as follows:
the rod part volume of the connecting rod blank of the low-speed diesel engine is 0.9-0.95 times of the rod part volume of the connecting rod of the die forging forming marine low-speed diesel engine,
the diameter of the rod part of the connecting rod blank of the low-speed diesel engine is 1.05-1.1 times of the diameter of the rod part of the connecting rod of the low-speed diesel engine for die forging forming ship,
the length of the rod part of the connecting rod die forging blank of the low-speed diesel engine is smaller than that of the rod part of the connecting rod of the low-speed diesel engine for the die forging forming ship by C, and C is 50-120 mm;
the relation between the thin end of the connecting rod blank of the low-speed diesel engine and the thin end of the connecting rod of the low-speed diesel engine for the die forging forming ship is as follows: the included angle between the thin end cone part of the connecting rod blank of the low-speed diesel engine and the rod is more than 120 degrees;
the volume of the thin end of the connecting rod blank of the low-speed diesel engine is 1.05 to 1.2 times of the volume of the thin end of the connecting rod of the die forging forming marine low-speed diesel engine,
the width of the thin end of the connecting rod blank of the low-speed diesel engine is smaller than the width of the thin end of the connecting rod of the low-speed diesel engine for the ship formed by die forging, wherein D is 100-400 mm;
the thickness of the blank of the connecting rod die forging blank of the low-speed diesel engine is smaller than that of the thin end of the connecting rod of the low-speed diesel engine for the ship formed by die forging by E, and E is 0-50 mm;
the length of the thin end of the connecting rod die forging blank of the low-speed diesel engine is calculated by the volume, the width and the thickness;
2) sawing two ends of a connecting rod blank of a low-speed diesel engine flat, and processing a rod part to finish machining for 10mm allowance; the machining section of the rod part of the low-speed diesel engine connecting rod blank and the thick and thin end transition conical surfaces and the blank surface of the low-speed diesel engine connecting rod blank adopt conical surface transition of more than 120 degrees; obtaining a die forging blank of the connecting rod of the low-speed diesel engine;
3) locally heating the thick end or the thin end of the low-speed diesel engine connecting rod die forging blank to a forging temperature by adopting a blank local heating furnace or a variable-capacity tunnel type connecting rod heating furnace;
4) performing die forging on the heated thick end or the heated thin end in the step 3) by adopting a die for locally forging the special-shaped connecting rod at two ends, forming an inner concave surface of the thick end or the thin end, and simultaneously forming a transition surface and an appearance of the thick end or the thin end to obtain a semi-finished product of the connecting rod of the low-speed diesel engine;
5) repeating the step 3), and heating the thin end or the thick end of the low-speed diesel engine connecting rod die forging blank which is not locally heated by using a blank local heating furnace or a variable-capacity tunnel type connecting rod heating furnace;
6) and (3) replacing the die, adopting the die for locally die forging the marine low-speed diesel engine connecting rod, repeating the step 4), and carrying out die forging on the thin end or the thick end of the locally heated low-speed diesel engine connecting rod die forging blank in the step 5), so as to form an inner concave surface of the thin end or the thick end, and simultaneously form a transition surface and an appearance of the thin end or the thick end, thereby obtaining the low-speed diesel engine connecting rod.
2. The local die forging forming method for the connecting rod of the marine low-speed diesel engine according to claim 1, characterized by comprising the following steps of: the low speed diesel connecting rod die forging blank allows the presence of irregular pits left by a free forging anvil of less than 30 mm.
3. The local die forging forming method for the connecting rod of the marine low-speed diesel engine according to claim 1, characterized by comprising the following steps of: the specific method for heating by using the blank local heating furnace in the step 3) and the step 5) comprises the following steps:
opening the furnace door, extending a piston rod of the hydraulic cylinder, and turning the turning platform around the rotating shaft to a horizontal state; hoisting the low-speed diesel engine connecting rod die forging blank to a turnover platform of a turnover mechanism in a horizontal state, and putting the end of the low-speed diesel engine connecting rod die forging blank needing to be heated into a blank local heating furnace; selecting a clutch and a clutch of a hole with the section and the size matched with those of the blank non-heating section, and mounting the clutch and the clutch on a furnace door; closing the furnace door, and precisely fitting the holes of the clutch nut and the clutch nut with the non-heating section of the connecting rod die forging blank of the low-speed diesel engine; starting a heat source to heat a section of the connecting rod die forging blank of the low-speed diesel engine, which needs to be heated; after the temperature is sufficiently kept at the forging temperature, the furnace door is opened, and a piston rod of the hydraulic cylinder returns to drive the overturning platform to overturn downwards around the rotating shaft to a vertical state; and hoisting the die forging blank of the connecting rod of the low-speed diesel engine, wherein the heating process of the die forging blank of the connecting rod of the low-speed diesel engine in a heating section is completed.
4. The local die forging forming method for the connecting rod of the marine low-speed diesel engine according to claim 1, characterized by comprising the following steps of: step 3) and step 5) using a variable-volume tunnel type connecting rod heating furnace for heating, wherein a low-speed diesel engine connecting rod die forging blank is hung on an objective table, the end needing to be heated is upward, the non-heated end is positioned in a foundation pit, and a sealing block is inserted for sealing; the loading vehicle hung with the low-speed diesel engine connecting rod die forging blanks advances forwards along the track and enters the furnace chamber, the step 3) and the step 5) are repeated, the subsequent loading vehicles are connected end to end and sequentially loaded into the furnace, and after the feeding quantity reaches a preset quantity, the furnace chamber is sealed along with the movable trolley loaded feeding furnace door; heating the forging blank to a forging temperature by a heating system; when discharging, a discharging furnace door is opened, all the loading cars and the feeding furnace door in the furnace move forward by a station, the first low-speed diesel engine connecting rod die forging blank is pushed out of the furnace chamber, the discharging furnace door is closed, and the rest low-speed diesel engine connecting rod die forging blanks continue to preserve heat; after the blank is taken out of the furnace, the sealing block is drawn out, and the hanging tongs clamp the die forging blank of the connecting rod of the low-speed diesel engine to exit from the U-shaped groove and hang away; and repeating the operation to finish discharging.
5. The local die forging forming method for the connecting rod of the marine low-speed diesel engine according to claim 1, characterized by comprising the following steps of: step 4) adopting a die forging method for locally forging the die forging blank of the connecting rod of the low-speed diesel engine, wherein two half dies are opened, and hot ends of the special-shaped connecting rods at two ends are upward and hoisted into the middle of the half dies; the push-pull head pushes the two half-moulds to be matched; the outer mold ring is sleeved for hooping; the press drives the punch to press into the heated end in the semi-mold, and the heated end is formed to obtain a semi-finished product; the outer mold ring is hoisted out together with the half mold and the semi-finished product of the special-shaped connecting rod at two ends, the outer mold ring is separated and moved away, the half mold is pulled open, and the semi-finished product is hoisted out.
6. The local die forging forming method for the connecting rod of the marine low-speed diesel engine according to claim 5, characterized by comprising the following steps of: the shape of a cavity formed by two half dies of the die for locally die forging the low-speed diesel engine connecting rod die forging blank is consistent with that of two ends of the connecting rod, and a finish machining allowance is reserved in the cavity for 3-5 mm; the punch is consistent with the concave surfaces of the thick end or the thin end at the two ends of the connecting rod of the low-speed diesel engine, and a finish machining allowance of 5-10mm is reserved on the concave surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910059086.8A CN109822038B (en) | 2019-01-22 | 2019-01-22 | Local die forging forming method for connecting rod of marine low-speed diesel engine |
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| CN110026516B (en) * | 2019-06-03 | 2020-08-11 | 哈尔滨哈飞工业有限责任公司 | Combined forging method for 300M steel rocker arm forge piece |
| CN112743034A (en) * | 2019-10-29 | 2021-05-04 | 中船海洋动力部件有限公司 | Connecting rod free forging tool for marine diesel engine |
| CN110899586B (en) * | 2019-11-26 | 2021-06-08 | 江阴市龙玉锻压有限公司 | All-fiber forging process for U-shaped forging piece |
| CN114535476B (en) * | 2022-03-01 | 2023-11-28 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Accurate blank making method for large-scale marine connecting rod die forging |
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